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1 MA 137 Calculus I with Life Science Applications FIRST MIDTERM Fall /20/2016 Name: Sect. #: Do not remove this answer page you will return the whole exam. No books or notes may be used. Use the backs of the question papers for scratch paper. You may use a graphing calculator during the exam, but NO calculator with a Computer Algebra System (CAS) or a QWERTY keyboard is permitted. Absolutely no cell phone use during the exam is allowed. The first part of the exam consists of 12 multiple choice questions, each worth 5 points. Record your answers on this page by filling in the box corresponding to the correct answer. For example, if (a) is correct, you must write a b c d e Do not circle answers on this page, but please do circle the letter of each correct response in the body of the exam. It is your responsibility to make it CLEAR which response has been chosen. You will not get credit unless the correct answer has been marked on both this page and in the body of the exam. The second part of the exam consists of four open-response questions and one bonus question. When answering these questions, check your answers when possible. Clearly indicate your answer and the reasoning used to arrive at that answer. Unsupported answers may receive NO credit. 1. a b c d e 2. a b c d e GOOD LUCK! 3. a b c d e 4. a b c d e 5. a b c d e 6. a b c d e 7. a b c d e 8. a b c d e 9. a b c d e QUESTION SCORE OUT OF Multiple Choice 60 pts pts pts pts pts Bonus. 10 pts TOTAL 100 pts 10. a b c d e 11. a b c d e 12. a b c d e
2 Please make sure to list the correct section number on the front page of your exam. In case you forgot your section number, consult the following table: Sections # Lecturer Time/Location Alberto Corso MWF 10:00 am - 10:50 am, CB 118 Section # Recitation Instructor Time/Location 001 Luis Sordo Vieira TR 08:00 am - 08:50 am, CB Luis Sordo Vieira TR 09:00 am - 9:50 am, CB Kalila Sawyer TR 10:00 am - 10:50 am, CB Kalila Sawyer TR 11:00 am - 11:50 am, CB Stephen Deterding TR 12:00 pm - 12:50 pm, CB Stephen Deterding TR 01:00 pm - 01:50 pm, CB Matias von Bell TR 02:00 pm - 02:50 pm, CB Matias von Bell TR 03:00 pm - 03:50 pm, CB 339
3 1. The ph of a liquid is a measure of how acidic or basic it is. The concentration of hydrogen ions in a liquid is labeled [H + ]. Use the formula ph = log[h + ] to find the ph level, to the nearest tenth, of a liquid with [H + ] about (a) ph = 2.5 (b) ph = 2.5 (c) ph = 1.5 (d) ph = 1.5 (e) ph = Find the center C(h, k) and the radius r of the circle defined by the equation 2x 2 + 2y 2 + 6x 8y + 12 = 0. (a) C(3/2, 2) and r = 1/2 (b) C( 3/2, 2) and r = 1/4 (c) C(3/2, 2) and r = 1/4 (d) C( 3, 4) and r = 6 (e) C( 3/2, 2) and r = 1/2
4 3. Consider the function f(x) = 1. If you evaluate and simplify the expression x you obtain f(x + h) f(x) h (a) (b) (c) 1 (d) (e) 1 x(x + h) 1 x(x + h) h x(x + h) h x(x + h) 4. Write the logarithmic expression 2 log b q + 3 log b y as a single expression: (a) (2 + 3) log b (q + y) (b) log b (q 2 y 3 ) (c) log b (q 2 + y 3 ) ( (d) log b qy 2+3 ) ( ) q 2 (e) log b y 3
5 5. Which of these equations represents a line parallel to the line 2x + y = 6? (a) y = 2x + 3 (b) y 2x = 4 (c) 2x y = 8 (d) y = 2x + 1 (e) x 2y = 6 6. Let f(x) = 5x 2 4x + 3. Then the inverse f 1 (x) of f is: (a) f 1 (x) = 4x + 3 5x 2 (b) f 1 (x) = 2 5x 3 4x (c) f 1 (x) = 5/x 2 4/x + 3 (d) f 1 (x) = 5 4x 3x + 2 (e) f 1 (x) = 3x x
6 7. Consider the functions f(x) = x + 3 and g(x) = 1 x 3 What is the simplified form of the composition function (g f)(x)? (a) g(f(x)) = x + 3 x 3, x 3 (b) g(f(x)) = 1 x, x 0 (c) g(f(x)) = 3x 8 x + 3, x 3 (d) g(f(x)) = 3x 8 x 3, x 3 (e) g(f(x)) = 8 x, x 0 8. Let B(t) denote the number of bacteria at time t (measured in hours) in a certain culture. The population grows according to the exponential growth model. Thus for some positive constants B 0 and r. B(t) = B 0 e rt Suppose the population has a doubling time of 20 hours. Find the constant r. (a) r = ln 2/20 (b) r = 20/ ln 2 (c) r = 1/2 (d) r = 2 (e) None of the above.
7 9. The initial amount of a certain medication in a patient s bloodstream is 12 mg/cm 3. Every hour the concentration is reduced by 14%. Which represents the amount of medication in the bloodstream, A(t), in mg/cm 3, over time t, in hours? (a) A(t) = 12(0.14) t (b) A(t) = 12e 0.14t (c) A(t) = 12(0.86) t (d) A(t) = 14(0.88) t (e) A(t) = 12e 0.86t 10. The half-life of a certain radioactive material is 85 days. An initial amount of the material has a mass of 801 kg. Write an exponential function that models the decay of this material y at time t. Find how much radioactive material remains after 10 days. Round your answer to the nearest thousandth. (a) y = 1 2 ( ) t ; kg 801 ( ) 1 1 (b) y = t ; kg ( ) 1 85t (c) y = 801 ; 2 0 kg ( ) 1 1 (d) y = 2 85 t ; kg 801 ( ) 1 1 (e) y = t ; kg 2
8 11. The sequence {b n } is recursively defined by Find b n for n = 1, 2, 3, 4, 5. b n+1 = 3b n 2 b 0 = 2. (a) 2, 4, 10, 28, 82 (b) 2, 8, 26, 80, 242 (c) 4, 10, 28, 82, 244 (d) 10, 28, 82, 244, 730 (e) None of the above 12. Find a formula for the general term a n of the sequence starting with a , 4 8, 9 15, 16 24, 25 35,... (a) a n = (b) a n = (c) a n = (d) a n = (e) a n = n 2 (n + 1) 2 1 n 1 n 2 (n + 1) 2 1 n 0 (n + 1)2 (n + 2) 2 1 n 1 n (n + 1) n 0 (n + 1)2 (n + 2) 2 1 n 0
9 13. Solve for x: (a) ln(x + 2) + ln(x 2) = 1 (b) 3 5x 1 = 9 x pts: /10
10 14. The table below is based on a functional relationship between x and y that is either an exponential or a power function: x y Use an appropriate logarithmic transformation and a graph to decide whether the table comes from a power function or an exponential function, power function exponential function and find the functional relationship between x and y: y = pts: /10
11 15. (Adapted from Benton and Harper, 1997) In vertebrates, embryos and juveniles have large heads relative to their overall body size. As the animal grows older, proportions change; for instance, the ratio of skull length to body length diminishes. That this is the case not only for living vertebrates, but also for fossil vertebrates, is shown by the following example. Ichthyosaurs are a group of marine reptiles that appeared in the early Triassic and died out well before the end of the Cretaceous. They were fish shaped and comparable in size to dolphins. In a study of 20 fossil skeletons, the following allometric relationship between backbone length B (measured in cm) and skull length S (measured in cm) was found S = 1.162B 0.93 (a) Use a suitable logarithmic transformation of B and S so that the resulting relationship is linear. What is the linear relationships that you found? (b) Graph the resulting linear relationship in the appropriate plot below. Mark your choice clearly and make your plot accurate! pts: /10
12 16. (a) Consider a population model with emigration given by p n+1 = 1.1p n 3, 000 n = 0, 1, 2,... with an initial population of p 0 = 10, 000. Find the population at the next three time intervals. Namely, p 1, p 2 and p 3. (b) Find the limit as n tends to of the following explicit sequence. Justify your answer: 2n n lim n (5 3n)n pts: /10
13 Bonus. Consider the sequence and assume that the limit exists. a n+1 = 1 2 ( a n + 9 ) a n (a) Find all fixed points of {a n }. (b) Use a table or other reasoning to find which fixed point is the limiting value when a 0 = 1. pts: /10
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